Yes. Pink eye is very contagious. It tends to jump to the other eye and to other people who you come in contact with. We touch our eyes then other objects a lot and the lacrimal duct drains into the nasopharynx so it tends to spread with any cough or sneeze. I'm not sure of this, but i suspect it takes a day or two from being infected to being visible, so you had it longer than you think.